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add validation to check if stagingPath exists

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It's CO responsibility to create the
stagingPath as per the CSI spec.

The CO SHALL ensure
// that the path is directory and that the process serving the
// request has `read` and `write` permission to that directory. The
// CO SHALL be responsible for creating the directory if it does not
// exist.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>
This commit is contained in:
Madhu Rajanna 2019-07-25 14:31:10 +05:30 committed by mergify[bot]
parent 5af29662b2
commit dfbdec4b6a
4 changed files with 53 additions and 22 deletions
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9
pkg/cephfs/nodeserver.go
View File

@ -104,11 +104,6 @@ func (ns *NodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVol
}
}
if err = util.CreateMountPoint(stagingTargetPath); err != nil {
klog.Errorf("failed to create staging mount point at %s for volume %s: %v", stagingTargetPath, volID, err)
return nil, status.Error(codes.Internal, err.Error())
}
idLk := nodeVolumeIDLocker.Lock(string(volID))
defer nodeVolumeIDLocker.Unlock(idLk, string(volID))
@ -289,10 +284,6 @@ func (ns *NodeServer) NodeUnstageVolume(ctx context.Context, req *csi.NodeUnstag
return nil, status.Error(codes.Internal, err.Error())
}
if err = os.Remove(stagingTargetPath); err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
klog.Infof("cephfs: successfully unmounted volume %s from %s", req.GetVolumeId(), stagingTargetPath)
return &csi.NodeUnstageVolumeResponse{}, nil

53
pkg/rbd/nodeserver.go
View File

@ -91,10 +91,10 @@ func (ns *NodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVol
idLk := nodeVolumeIDLocker.Lock(volID)
defer nodeVolumeIDLocker.Unlock(idLk, volID)
// Check if that target path exists properly
isNotMnt, err := ns.createMountPath(stagingTargetPath, isBlock)
if err != nil {
klog.Errorf("stat failed: %v", err)
var isNotMnt bool
// check if stagingPath is already mounted
isNotMnt, err = mount.IsNotMountPoint(ns.mounter, stagingTargetPath)
if err != nil && !os.IsNotExist(err) {
return nil, status.Error(codes.Internal, err.Error())
}
@ -117,19 +117,27 @@ func (ns *NodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVol
klog.V(4).Infof("rbd image: %s/%s was successfully mapped at %s\n", req.GetVolumeId(), volOptions.Pool, devicePath)
isMounted := false
isStagePathCreated := false
// if mounting to stagingpath fails unmap the rbd device. this wont leave any
// stale rbd device if unstage is not called
defer func() {
if err != nil {
ns.cleanupStagingPath(stagingTargetPath, devicePath, volID, isBlock, isMounted)
ns.cleanupStagingPath(stagingTargetPath, devicePath, volID, isStagePathCreated, isBlock, isMounted)
}
}()
err = ns.createStageMountPoint(stagingTargetPath, isBlock)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
isStagePathCreated = true
// nodeStage Path
err = ns.mountVolumeToStagePath(req, stagingTargetPath, devicePath)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
isMounted = true
err = os.Chmod(stagingTargetPath, 0777)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
@ -140,7 +148,7 @@ func (ns *NodeServer) NodeStageVolume(ctx context.Context, req *csi.NodeStageVol
return &csi.NodeStageVolumeResponse{}, nil
}
func (ns *NodeServer) cleanupStagingPath(stagingTargetPath, devicePath, volID string, isBlock, isMounted bool) {
func (ns *NodeServer) cleanupStagingPath(stagingTargetPath, devicePath, volID string, isStagePathCreated, isBlock, isMounted bool) {
var err error
if isMounted {
err = ns.mounter.Unmount(stagingTargetPath)
@ -149,7 +157,7 @@ func (ns *NodeServer) cleanupStagingPath(stagingTargetPath, devicePath, volID st
}
}
// remove the block file created on staging path
if isBlock {
if isBlock && isStagePathCreated {
err = os.Remove(stagingTargetPath)
if err != nil {
klog.Errorf("failed to remove stagingtargetPath: %s with error: %v", stagingTargetPath, err)
@ -161,6 +169,21 @@ func (ns *NodeServer) cleanupStagingPath(stagingTargetPath, devicePath, volID st
}
}
func (ns *NodeServer) createStageMountPoint(mountPath string, isBlock bool) error {
if isBlock {
pathFile, err := os.OpenFile(mountPath, os.O_CREATE|os.O_RDWR, 0750)
if err != nil {
klog.Errorf("failed to create mountPath:%s with error: %v", mountPath, err)
return status.Error(codes.Internal, err.Error())
}
if err = pathFile.Close(); err != nil {
klog.Errorf("failed to close mountPath:%s with error: %v", mountPath, err)
return status.Error(codes.Internal, err.Error())
}
}
return nil
}
// NodePublishVolume mounts the volume mounted to the device path to the target
// path
func (ns *NodeServer) NodePublishVolume(ctx context.Context, req *csi.NodePublishVolumeRequest) (*csi.NodePublishVolumeResponse, error) {
@ -180,7 +203,7 @@ func (ns *NodeServer) NodePublishVolume(ctx context.Context, req *csi.NodePublis
defer targetPathLocker.Unlock(idLk, targetPath)
// Check if that target path exists properly
notMnt, err := ns.createMountPath(targetPath, isBlock)
notMnt, err := ns.createTargetMountPath(targetPath, isBlock)
if err != nil {
return nil, err
}
@ -280,7 +303,7 @@ func (ns *NodeServer) mountVolume(stagingPath string, req *csi.NodePublishVolume
return nil
}
func (ns *NodeServer) createMountPath(mountPath string, isBlock bool) (bool, error) {
func (ns *NodeServer) createTargetMountPath(mountPath string, isBlock bool) (bool, error) {
// Check if that mount path exists properly
notMnt, err := mount.IsNotMountPoint(ns.mounter, mountPath)
if err != nil {
@ -376,8 +399,10 @@ unmount:
stagingTargetPath = blockStagingPath
goto unmount
}
if err = os.RemoveAll(stagingTargetPath); err != nil {
return nil, status.Error(codes.Internal, err.Error())
if stagingTargetPath == blockStagingPath {
if err = os.Remove(stagingTargetPath); err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
}
return &csi.NodeUnstageVolumeResponse{}, nil
}
@ -391,8 +416,10 @@ unmount:
return nil, err
}
if err = os.RemoveAll(stagingTargetPath); err != nil {
return nil, status.Error(codes.Internal, err.Error())
if stagingTargetPath == blockStagingPath {
if err = os.Remove(stagingTargetPath); err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
}
klog.Infof("rbd: successfully unmounted volume %s from %s", req.GetVolumeId(), stagingTargetPath)

8
pkg/util/util.go
View File

@ -125,6 +125,14 @@ func CreateMountPoint(mountPath string) error {
return os.MkdirAll(mountPath, 0750)
}
// checkDirExists checks directory exists or not
func checkDirExists(p string) bool {
if _, err := os.Stat(p); os.IsNotExist(err) {
return false
}
return true
}
// IsMountPoint checks if the given path is mountpoint or not
func IsMountPoint(p string) (bool, error) {
dummyMount := mount.New("")

5
pkg/util/validate.go
View File

@ -24,6 +24,11 @@ func ValidateNodeStageVolumeRequest(req *csi.NodeStageVolumeRequest) error {
return status.Error(codes.InvalidArgument, "stage secrets cannot be nil or empty")
}
// validate stagingpath exists
ok := checkDirExists(req.GetStagingTargetPath())
if !ok {
return status.Error(codes.InvalidArgument, "staging path doesnot exists on node")
}
return nil
}